Has anyone eslse used the gas tuner from bullydog? - I dont know about that. Because a dyno test can have a variant of different reasons for why the results ...

I dont know about that. Because a dyno test can have a variant of different reasons for why the results will very. The biggest one being climate. Unless there were no changes at all during both tests then saying that synthetic oil increases horse power is farce. Even vehicles of the same type with same setup will show different results. The TBS can increase power and efficiency due to it allowing more air to be accumulated in the intake. Kind of the same thing as a cold air intake only instead of condensing the air it is pressurizing it. So now you have cooled and pressurized air being combusted. Not saying it will be extremely significant but i can only see it being more so than using a synthetic oil.

Also changing from a regular oil to a synthetic accumulates sludge and build up in the engine. I just had the valve covers off my truck and its at 133K with no sludge. Ill stick with what works.

puppeteer wrote:Look forward to seeing what someone else gets with the tuner. i get a average of 11 MPG going up and down mountains in hawaii. And about 15 highway when not so many hills

I forgot to ask...what mileage were you getting before the tuner install?

puppeteer wrote:I dont know about that. Because a dyno test can have a variant of different reasons for why the results will very. The biggest one being climate. Unless there were no changes at all during both tests then saying that synthetic oil increases horse power is farce. Even vehicles of the same type with same setup will show different results. The TBS can increase power and efficiency due to it allowing more air to be accumulated in the intake. Kind of the same thing as a cold air intake only instead of condensing the air it is pressurizing it. So now you have cooled and pressurized air being combusted. Not saying it will be extremely significant but i can only see it being more so than using a synthetic oil.

Also changing from a regular oil to a synthetic accumulates sludge and build up in the engine. I just had the valve covers off my truck and its at 133K with no sludge. Ill stick with what works.

It's your truck, and you're free to do what you want with it. All I'm saying is, from a guy who had the TBS craze a year ago, the best way to use one is to leave it off the truck. It makes it sound cool, and that's it. I had it on for a number of months, and couldn't tell a lick of difference when I took it off. It's a waste of money.

Also, there is no harm whatsoever in switching to synthetic. Since synthetic is superior in every form to conventional oil, you'll actually decrease any sludge buildup (if there is any). Heck, synthetic is so good, AMSOIL guarantees their Signature oil for 25,000 miles\1 year.

Those are my opinions, and I feel I have the consensus of not only other truck owners, but people who have tested these things out in a lab. But, I respect your ownership of your truck, and won't be critical of your opinion on such topics.

Easy E wrote:

puppeteer wrote:Look forward to seeing what someone else gets with the tuner. i get a average of 11 MPG going up and down mountains in hawaii. And about 15 highway when not so many hills

I forgot to ask...what mileage were you getting before the tuner install?

I was getting 9mpg on average and 12 MPG highway.

And as far as being critical goes i don't mind if anyone is or not, Makes for a better topic conversation when there can be a debate on what is better or not. No tin skins here

Well, so far not stellar results. Keep in mind my 3500 has 6" lift with 35" tires. Also has a Volant intake and Flowmaster cat back (replaced Flowmaster muffler with a stainless Magnaflow). DIC is showing about 13 mpg highway. Average commuting (1/2 highway, 1/2 city) is about 10 mpg. I'll hand calculate MPG at the next fill and will also update after towing my toyhauler at the end of this month.

So did you see any performance difference?

I'm using the "regular" tune, but don't notice a difference in performance...

I get very similar performance with my 2001, K&N air intake system, and Bully Dog. Engine is more efficient @2100 rpm than it is @1800 where my runs at 55 mph. I once towed a Pettibone Hi lift Forklift on a gooseneck, about 26000 gross combination weight. My bosses F350 was down. It moved it ok (before modifications) but I ran 30-40 mph tops with high rpm's, transmission would not upshift with that kind of load, and got about 4 mpg.

well the 8.1 with Allison is only rated for 15000lbs. I prolly would have turned tow/haul on and retuned to towing